JPH01130702A - Solvent for removing adhered water - Google Patents

Abstract

PURPOSE:To remove adhered water without exerting an adverse influence upon removing the water from assembly parts, by contg. trichlorodifluoroethane as an effective component, and org. solvent and/or surface active agent. CONSTITUTION:The solvent for removing the water adhered to lens, parts for liq. crystal display, etc., contains trichlorodifluoroethane as an effective component. Also, it contains the org. solvent such as straight chain or cyclic, satd. or unsatd. hydrocarbons having 1-15 carbon atom such as n-pentane, or the surface active agent such as polyoxyethylene alkyl ether. And, by applying the solvent by spraying, cold bath, etc., the water is removed without exerting the adverse influence upon the assembly parts constituting of metal, plastic, etc., and besides, with suppressing the destruction of ozone layer and the occurrence of skin cancer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a solvent for removing water adhered to lenses, liquid crystal display device parts, electronic parts, precision mechanical parts, etc.

[Prior Art] After washing parts of liquid crystal display devices, electronic parts, precision mechanical parts, etc., in many cases, products cannot be manufactured if water remains attached to them. Therefore, water is usually removed using an organic solvent. As the organic solvent, 1.1.2-trichloro-1,2,2-trifluoroethane (hereinafter referred to as R113) is widely used because of the following intraspecific advantages.

R113 is nonflammable, non-exposed, has low toxicity, and has excellent stability. Moreover, adhering water can be removed without damaging base materials such as metals, plastics, and elastomers. In general, many of the objects to be treated from which attached water is removed are composite parts made of metal, plastic, elastomer, etc. Therefore, R113 was advantageous from this point as well.

[Problems to be solved by the invention] The present invention solves the problem that conventionally used R113, although it has various advantages, is suspected of destroying stratospheric ozone and causing skin cancer. In response to this, the object of the present invention is to provide a new solvent for removing adhered water that can remove water in the same way as R113.

[Means for solving the problems] The present invention has been made to achieve the above-mentioned objects,
The present invention provides a solvent for removing adhered water containing trichlorodifluoroethane as an active ingredient.

Trichlorodifluoroethane, which is the active ingredient of the solvent for removing adhered water of the present invention, is an excellent solvent that has the same advantages as conventional R113, such as being nonflammable and being able to remove adhered water without damaging the object to be removed. It is. Trichlorodifluoroethane includes 1,1.2-)dichloro-2,2-difluoroethane (hereinafter referred to as R122), 1,2.
2-trichloro-1,2-difluoroethane (hereinafter referred to as R1
22a) and l.

Three types of isomers of 1.1-)dichloro-2,2-difluoroethane (hereinafter referred to as R122b) are known, and these can be used alone or as a mixture of two or more types.

The solvent for removing adhered water of the present invention may contain various other components depending on various purposes. For example, in order to enhance the effect of removing adhered water, hydrocarbons, alcohols, ketones, or , organic solvents such as chlorinated hydrocarbons, or surfactants. The content of these organic solvents in the solvent for removing adhered water is 0 to 50% by weight, preferably 10 to 50% by weight.
It is 40% by weight, more preferably 20 to 30% by weight. If the mixture of trichlorodifluoroethane and the organic solvent has an azeotropic composition, it is preferred to use the azeotropic composition.

The content ratio of surfactant in the solvent for removing adhered water is 0 to 1.
0% by weight, preferably 0.1-5% by weight, more preferably 0.2-1% by weight.

The hydrocarbons are preferably linear or cyclic saturated or unsaturated hydrocarbons having 1 to 15 carbon atoms, such as n-pentane, impentane, n-hexane, isohexane, 2-methylpentane, 2,2-dimethylbutane. , 2,3-dimethylbutane, n-hebutane, isohebutane, 3-methylhexane, 2,4-dimethylpentane, n-octane, 2-
Methylhebutane, 3-methylhebutane, 4-methylhebutane, 2.2-dimethylhexane, 2,5-dimethylhexane, 3.3-dimethylhexane, 2-methyl-3-
Ethylpentane, 3-methyl-3-ethylpentane, 2
．． 3.3-trimethylpentane, 2,3.4-trimethylpentane, 2,2.3-)dimethylpentane, isooctane, nonane, 2,2.5-)dimethylhexane, decane, dodencane,! -pentene, 2-pentene, l-
Hexene, l-octene, l-nonene, 1-thecene,
It is selected from cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, ethylcyclohexane, bicyclohexane, cyclohexene, α-pinene, dipentene, decalin, tetralin, amidino, amylnaphthalene, and the like. More preferably n-
These include pentane, n-hexane, n-hebutane, and the like.

The alcohols are preferably linear or cyclic saturated or unsaturated alcohols having 1 to 17 carbon atoms, such as methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, 5ea-butyl alcohol, isobutyl alcohol, tert-butyl alcohol, pentyl alcohol, 5ec-7myl alcohol, l-ethyl-1-propatol, 2-methyl-1
-butanol, impentyl alcohol, tert-pentyl alcohol, 3-methyl-2-butanol, neopentyl alcohol, 1-hexanol, 2-methyl-
1-pentanol, 4-methyl-2-pentanol, 2
-ethyl-1-butanol, 1-heptatool, 2-heptatool, 3-heptatool, l-octatool, 2
-octatool, 2-ethyl-1-hexanol, l-
Nonanol, 3,5.5-trimethyl-l-hexanol, l-decanol, l-undecanol, 1-F7"
Canol, allyl alcohol lopargyl alcohol, benzyl alcohol, cyclohexanol, l-methylcyclohexanol, 2-methylcyclohexanol, 3
-Methylcyclohexanol, 4-methylcyclohexanol, α-terpineol, avinitinol, 2.6
-dimethyl-4-heptatool, trimethylnonyl alcohol, tetradecyl alcohol, heptadecyl alcohol and the like. More preferred are methanol, ethanol, isopropyl alcohol and the like.

Acetone, methyl ethyl ketone, 2-pentanone, 3-pentanone, 2-
Hexanone, methyl-n-butyl ketone. Methyl butyl ketone, 2-heptanone, 4-heptanone, diisobutyl ketone, acetonylacetone, mesityl oxide,
It is selected from holone, methyl-n-amyl ketone, ethyl butyl ketone, methylhexyl ketone, cyclohexanone, methylcyclohexanone, isophorone, 2,4-pentanedione, diacetone alcohol, acetophenone, fencheon, and the like. More preferred are acetone, methyl ethyl ketone and the like.

jfJ The hydrogenated hydrocarbons are preferably saturated or unsaturated, chlorinated hydrocarbons having 1 to 2 carbon atoms, such as methylene chloride, carbon tetrachloride, 1.1-dichloroethane, 1.2-dichloroethane, 1,1 .1-trichloroethane, 1,1
．． 2-trichloroethane, 1,1,1.2-tetrachloroethane, 1,1,2.2-tetrachloroethane,
Pentachloroethane, 1,1-dichloroethylene, l,
It is selected from 2-dichloroethylene, trichlorethylene, tetrachlorethylene, etc. More preferred are methylene chloride, 1.1.1-trichloroethane, trichlorethylene, tetrachlorethylene and the like.

The surfactant can be selected from various commonly used surfactants for removing adhered water, but preferably polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl ester, polyoxy There are those selected from ethylene polyoxypropylene alkyl ester, polyoxyethylene alkylphenol, polyoxyethylene polypropylene alkylphenol, polyoxyethylene sorbitan ester, polyoxyethylene polyoxypropylene alkyl ester, caprylamine caprylate, polyoxyethylene alkylamide, and the like. More preferred are caprylamine caprylate and polyoxyethylene alkylamide.

As a method for removing adhered water using the solvent for removing adhered water of the present invention, a method using a spray, a shower method, an immersion method using a cold bath, a hot bath, a steam bath, or an ultrasonic bath, or an immersion method using a combination of these baths may be adopted. Can be done.

[Examples] Examples 1 to 8 A test for removing adhered water was conducted using the solvent for removing adhered water shown in Table 1 below.

After immersing a glass plate with a thickness of 30ta layers x 18 layers a + The removal status of attached water was investigated based on the amount. The results are shown in Table 1.

Table 1 () shows the mixing ratio [wt%] O: Can be removed well Δ: A small amount remains It has an excellent removal effect.

Also, like the conventionally used R113, it has little effect on attacking metals, plastics, elastomers, etc., so it is possible to remove adhering water without adversely affecting the drainage of these composite parts.

Claims (2)

[Claims] (1) A solvent for removing adhered water containing trichlorodifluoroethane as an active ingredient. (2) Claim 1, wherein the solvent for removing adhered water contains at least one selected from hydrocarbons, alcohols, ketones, chlorinated hydrocarbons, and surfactants. Solvent for removing adhered water.